Car-truck



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W. B. MACK.

.GAR TRUCK.

No. 340,336. Patented Apr. 20, 1886.

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W. B. MACK.

GAR TRUGK.

No. 340,336. PatentedApr. 20, 1886.

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SPECIFICATION forming part of Let-tera Patent No. 340,336, dated April 20, 1886.

(No model.)

To @ZZ whom t may concert/1,:

Be it known that I, WILLIAM B. MACK, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Railway-Car Trucks, of which the following is a specification.

My invention relates to trucks for railwaycars, and particularly to trucks designed to be.

employed on elevated roads, constructed as represented in my application for LettersPatent of the United States, iiled in the Patent Oice December 26, 1885, Serial No. 186, 739, in which there are three rails-two arranged, as usual, for the side wheels of the car or truck, and a third arranged inthe center of the two side rails andata lower plane for an additional wheel or wheels.

It is the object of my invention to construct a truck which shall be adapted to railwaytracks of the character mentioned, and which shall render practicable the use of tracks as thus constructed.

My invention consists in a railway-truck provided ou opposite sides thereof with wheels arranged somewhat as usual with respect to the platform of the truck, and an additional wheel or wheels arranged at a lowerhorizontal plane than and centrally between the first-mentioned wheels, said truck being adapted to be swiveled at or near its center to the car by the usual king-bolt connection.

In the drawings hereto annexed and forming a part of' this specification, Figure 1 represents atop plan View of my improved railway-truck. Fig. 2 represents aside View thereof. Fig. 3 represents a rear end View. Fig.

4. represents a side elevation of a modification, v

showing a different arrangement of the side wheels with respect to the center wheel with double the number of the former wheels. Fig. 5 is aplan, and Fig. 6 a rear elevation, ofthe same. Fig. 7 is a side view. and Fig. 8 is a plan view, of another modification, showinga still different arrangement of the wheels with respect to each other, the number of side and center wheels being equal.

Similar letters refer to similar parts in all of the figures.

In the drawings, ct, Figs. 1, 2, and 3, represents the upper bolster of the truck, andb the lower bolster, between which are interposedy springs c of any suitable character. On up= per bolster, a, is secured the bearing-plate d, through which the king-bolt e projects, all as usual in railway trucks as commonly constructed. The upper face ofsaid bolster a is also provided with the usual shoes, f.

Projecting outwardly and forwardly from the frame A are supportsg for the journalboxes h of the axle fi, tov which the forward wheels, j, are secured, as usual. Supports k for the journal-boxes Z of rear wheel, m, are also secured to the frame A, and project downwardly and rearwardly therefrom, as shown, whereby I am enabled not only to construct said rear wheel, m, of' much larger size than the forward wheels, j, but also to journal it to a much lower horizontal planeand thus adapt the truck to tracks of the construction shown and described in my said application.

In Figs. 4, 5. and 6 I have shown a modification of' my invention in which a four-wheel truck constructed in much the usual manner is provided about its centerwith an additional wheel, m', of larger diameter journaled in hangers a, projecting downwardly from the platform 0,. By this means the additional wheel is adapted to travel on the center lower rail ofthe track shown and described in my aforesaid application.

Another modification, similar to that just described, is shown in Figs. 7 and 8. In this instance, however, the truck is provided with but two wheels for traversing the upper rails of' the track, and with the same number of' wheels journaled-in hangers projecting below the platform. frontand rear` much in the same man ner as in the hangers in the center of' the platform in Figs. 1l, 5, and 6.'

In the modifications the axles of the lower and larger wheels may be provided on their ends with cranks ci', by which means electrical power may be readily employed to propel the truck and its attached car.

By the construction shown and described I 95 the form of the platform of the truck or de IOO vices for supporting the journal-boxes of the wheels,or in the arrangement or relationship of the wheels without departing from the spirit of my invention.

In the instruction shown in Figs. 4. 5,:1nd 6 l muy ili-pcnse with thc linnen-s on the upper wheels of thetrnck, und in lieu thereol'employ irietion\vhcels p, aditpted to rnn against the sidesoi the rails. This construction is found advantageous in roundinl,r short curves and in some otberinstnncesand may obviously be employed on all ol' the forms of my truck, if the exigencias of the case require it.

A railway-car-truck provided with wheels on WILLIAM B. MACK.

` Witnesses:

C. F. BROWN, ARTHUR W. GRossLEY. 

